Bauder insulation for inverted roof construction

Insulation for use within inverted roof design needs to possess specific properties, as the environmental demands placed upon it are more severed than those placed upon insulation in a warm roof design.

As the insulation does not benefit from the protection of the waterproofing membranes, it needs to be impenetrable to water, resistant to rot and decay, and have a high compressive strength.

Bauder XPS CO2 extruded polstyrene insulation offers a low global warming potential (GWP), which is kinder to the environment and helps achieve credits for buildings that are subjected to BREEAM assessment

BauderJFRI is made from a special type of expanded polstyrene with high thermal efficiency and a GWP<5. We have two grades of EPS insulation, the BauderJFRI 200 grade which can withstand permanent loads of up to 60KPa, and the BauderJFRI 300 grade for permanent loads of up to 90KPa.

Vapour permeable membranes for better U Values

When carrying out thermal calculations for inverted roof design, allowance is made for the cooling effect of rainwater, which seeps between the joints in the insulation causing thermal bridging. The use of a vapour permeable membrane above the insulation reduces the level of cooling as most of the rainwater is discharged before it reaches the insulation.

This means that better U values can be achieved with the same thickness of insulation.